How to Replace Double with Single Quotes in JavaScript

Replace Double with Single Quotes in Strings #

To replace double with single quotes in a string:

1. Call the replaceAll() method on the string, passing it a string containing a double quote as the first parameter and a string containing a single quote as the second.
2. The replaceAll method returns a new string with all matches replaced.

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const str = 'He said: "test 123"';

const replaced = str.replaceAll('"', "'");
console.log(replaced); // 👉️ "He said: 'test 123'"

We pass the following parameters to the String.replaceAll method:

1. a substring to match in the string. In our case we want to match all double quotes in the string.
2. a replacement for each match. We replace each double quote with a single quote.

Alternatively, you could use backticks, if you find that more readable.

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const str = 'He said: "test 123"';

const replaced = str.replaceAll(`"`, `'`);
console.log(replaced); // 👉️ "He said: 'test 123'"

In the code snippet we use backticks to wrap the parameters we pass to the replaceAll method. This achieves the same result as alternating single and double quotes.

Note that the replaceAll method does not change the contents of the original string, it returns a new string with all matches replaced. Strings are immutable in JavaScript.

To replace double with single quotes in a string:

1. Call the replace() method on the string, passing it a regular expression matching all double quotes as the first parameter and a string containing a single quote as the second.
2. The replace method will return a new string with all matches replaced.

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// Supported in IE

const str = 'He said: "test 123"';

const replaced = str.replace(/"/g, "'");
console.log(replaced); // 👉️ "He said: 'test 123'"

The first parameter we pass to the String.replace method is a regular expression where we match all double quotes.

The forward slashes / / mark the beginning and end of the regular expression.

We use the g (global) flag, because we want to match all occurrences of a double quote in the string, and not just the first occurrence.

We provide a single quote as a replacement for each match.

If you ever need help reading a regular expression, check out this regex cheatsheet by MDN. It's definitely the best one out there.